Contents:
1. Introduction
Dragino Gateway is possible to support Listen Before Talk feature with an external USB to LoRaWAN module (this module in under development).
2. How to use
2.1 Upgrade File
Upgrade the firmware to version higher than > lgw--build-v5.4.1603422765-20201023-1130 . Firmware download, Firmware Changelog
2.2 Modify file to support LBT
Modify the Frequendy band file. for LG308 and OLG01, please modify file under /etc/lora/cfg-301/, for LPS8, modify file under /etc/lora/cfg-308/.
File content modify like below:
"lbt_cfg": {
"enable": false, ---> Change this to true
"rssi_target": -80,
"chan_cfg":[
{ "freq_hz": 922000000, "scan_time_us": 128 },
{ "freq_hz": 922200000, "scan_time_us": 128 },
{ "freq_hz": 922400000, "scan_time_us": 128 },
{ "freq_hz": 922600000, "scan_time_us": 128 },
{ "freq_hz": 922800000, "scan_time_us": 128 },
{ "freq_hz": 923000000, "scan_time_us": 128 },
{ "freq_hz": 923200000, "scan_time_us": 128 },
{ "freq_hz": 923400000, "scan_time_us": 128 ---> These are the frequency to be monitored. please note, the frequency must from low to high. Above settings is not correct.
],
"sx127x_rssi_offset": -4
},
2.3 Test
Apply and save in the web after above configure has been made
run "logread -f" in linux to check the LBT running status.